AST-608intermediate

Planet Formation & Migration: Physical Mechanisms

Planetary systems form in disks around young stars, but planets do not necessarily remain where they first assembled. Migration explains compact systems, eccentric giants, resonant chains, and why Solar-System architecture is only one possible outcome.

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Planet Formation & Migration: Physical Mechanisms

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AST-607Planet Formation & Migration: Structures & Vocabulary→

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AST-609Planet Formation & Migration: Observation, Measurement & Evidence→

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Planetary systems form in disks around young stars, but planets do not necessarily remain where they first assembled.

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A planet exchanges angular momentum with surrounding gas and launches density waves that can move it inward or outward.

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Hot Jupiters lie far inside likely giant-planet formation zones, resonant multiplanet systems preserve migration signatures, protoplanetary disks show rings and gaps, and population statistics disagree with models in which planets remain fixed at birth radii.